Characterization of New Excimer Pumped UV Laser Dyes I. <i>p</i>‐Terphenyls

Schneider, David J.; Landis, David A.; Fleitz, Paul A.; Seliskar, Carl J.; Kauffman, Joel M.; Steppel, Richard N.

doi:10.1155/lc.11.49

Cited by 25 publications

(24 citation statements)

References 7 publications

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“…Linear and recently reported cyclic oligo- p -phenyls with and without methyl and t -butyl substituents are among the simplest extended π -electron systems ( Chart 4 ). Linear oligo- p -phenyls have been utilized as luminophores in dye lasers and scintillators in near-UV and visible region for many years [ 76 , 77 , 78 ] due to their photochemically and thermally robust features. Although unsubstituted oligo- p -phenyls longer than five or six repeating units have limited solubility, p -dioxane is commonly used as a solvent for reasons not fully understood by the authors.…”

Section: Resultsmentioning

confidence: 99%

Questions of Mirror Symmetry at the Photoexcited and Ground States of Non-Rigid Luminophores Raised by Circularly Polarized Luminescence and Circular Dichroism Spectroscopy: Part 1. Oligofluorenes, Oligophenylenes, Binaphthyls and Fused Aromatics

et al. 2018

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We report experimental tests of whether non-rigid, π-conjugated luminophores in the photoexcited (S1) and ground (S0) states dissolved in achiral liquids are mirror symmetrical by means of circularly polarized luminescence (CPL) and circular dichroism (CD) spectroscopy. Herein, we chose ten oligofluorenes, eleven linear/cyclic oligo-p-arylenes, three binaphthyls and five fused aromatics, substituted with alkyl, alkoxy, phenyl and phenylethynyl groups and also with no substituents. Without exception, all these non-rigid luminophores showed negative-sign CPL signals in the UV-visible region, suggesting temporal generation of energetically non-equivalent non-mirror image structures as far-from equilibrium open-flow systems at the S1 state. For comparison, unsubstituted naphthalene, anthracene, tetracene and pyrene, which are achiral, rigid, planar luminophores, did not obviously show CPL/CD signals. However, camphor, which is a rigid chiral luminophore, showed mirror-image CPL/CD signals. The dissymmetry ratio of CPL (glum) for the oligofluorenes increased discontinuously, ranging from ≈ −(0.2 to 2.0) × 10−3, when the viscosity of the liquids increased. When the fluorene ring number increased, the glum value extrapolated at [η] = 0 reached −0.8 × 10−3 at 420 nm, leading to (–)-CPL signals predicted in the vacuum state. Our comprehensive CPL and CD study should provide a possible answer to the molecular parity violation hypothesis arising due to the weak neutral current mediated by the Z0-boson.

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Section: Resultsmentioning

confidence: 99%

Questions of Mirror Symmetry at the Photoexcited and Ground States of Non-Rigid Luminophores Raised by Circularly Polarized Luminescence and Circular Dichroism Spectroscopy: Part 1. Oligofluorenes, Oligophenylenes, Binaphthyls and Fused Aromatics

et al. 2018

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“…The experimental apparatus and methods used in this study have been described in detail in the previous paper. 7 Although these dyes have been examined over a period of months, the dye lifetime and conversion efficiency data come from measurements done under identical operating conditions. For the sake of internal standardization on a day-to-day basis, the dye BBQ, 9 dye 14 in Table 1, inp-dioxane solvent was used as a benchmark.…”

Section: Methodsmentioning

confidence: 99%

“…We found a very similar result for the 4,4"-t-alkylsubstituted p-terphenyls. 7 Thus, it appears that ring substitution by tertiary alkyl groups produces the most long-lived oligophenylene laser dyes.…”

Section: General Properties Of Dyesmentioning

confidence: 99%

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Characterization of New Excimer Pumped UV Laser Dyes 2. p‐Quaterphenyls

Fleitz

Seliskar

Steppel³

et al. 1991

Laser Chemistry

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New excimer-pumped laser dyes based on p-quaterphenyl are described and the associated performance parameters are presented. A discussion of the variations in the performance parameters found is made in terms of dye chemical structures. Most of the dyes studied are significantly better than the chosen reference dye BBQ. The best dye in the series (dye 3) is stabilized both by ring-alkylation and by ringbridging. The net effect is the production of a new dye with a lifetime ten times greater than that of the reference dye BBQ.

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“…It was found that the photoemission output could be increased further by adding two propyl groups to the methylene bridge. 23 The substitution of the terminal hydrogen atoms with alkoxy groups was generally found to red-shift the emission spectrum, 24 and for singly bridged molecules was also reported to enhance the photon to photon conversion efficiency of the dye. 25 Kauffman et al 23 found that the alkoxy substitution reduced the photostability of the compound, but Fleitz and co-workers 26 later reported that terminal tert-butyl substitution increases the stability.…”

Section: Introductionmentioning

confidence: 99%

A fast microchannel plate-scintillator detector for velocity map imaging and imaging mass spectrometry

Winter

King

Brouard

et al. 2014

Review of Scientific Instruments

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The time resolution achievable using standard position-sensitive ion detectors, consisting of a chevron pair of microchannel plates coupled to a phosphor screen, is primarily limited by the emission lifetime of the phosphor, around 70 ns for the most commonly used P47 phosphor. We demonstrate that poly-para-phenylene laser dyes may be employed extremely effectively as scintillators, exhibiting higher brightness and much shorter decay lifetimes than P47. We provide an extensive characterisation of the properties of such scintillators, with a particular emphasis on applications in velocity-map imaging and microscope-mode imaging mass spectrometry. The most promising of the new scintillators exhibits an electron-to-photon conversion efficiency double that of P47, with an emission lifetime an order of magnitude shorter. The new scintillator screens are vacuum stable and show no signs of signal degradation even over longer periods of operation.

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Characterization of New Excimer Pumped UV Laser Dyes I. p‐Terphenyls

Cited by 25 publications

References 7 publications

Questions of Mirror Symmetry at the Photoexcited and Ground States of Non-Rigid Luminophores Raised by Circularly Polarized Luminescence and Circular Dichroism Spectroscopy: Part 1. Oligofluorenes, Oligophenylenes, Binaphthyls and Fused Aromatics

Questions of Mirror Symmetry at the Photoexcited and Ground States of Non-Rigid Luminophores Raised by Circularly Polarized Luminescence and Circular Dichroism Spectroscopy: Part 1. Oligofluorenes, Oligophenylenes, Binaphthyls and Fused Aromatics

Characterization of New Excimer Pumped UV Laser Dyes 2. p‐Quaterphenyls

A fast microchannel plate-scintillator detector for velocity map imaging and imaging mass spectrometry

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